<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>MathML and size containment</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<style>
  /* Revert style specified in the UA style sheet that changes box size. */
  merror { border: 0; }
  mfrac { padding: 0; }
</style>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", runTests);

  function runTests() {

    for (tag in MathMLFragments) {
        if (!FragmentHelper.isValidChildOfMrow(tag) ||
            FragmentHelper.isEmpty(tag))
            continue;

        // TODO(https://github.com/w3c/mathml-core/issues/199): Check/decide how
        // size containment behave for these cases:
        // - table layout.
        // - radical layout.
        // - contain-intrinsic-block-size.
        // - operators width special drawing (stretchy/largop).
        if (tag == "mroot" || tag == "msqrt" || tag == "mtable") {
            continue;
        }

        document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
<div style="display: inline-block;"><math>${MathMLFragments[tag]}</math></div>\
</div>`);
        let div = document.body.lastElementChild;

        let elementContainer = div.firstElementChild;
        let element = FragmentHelper.element(elementContainer);
        FragmentHelper.forceNonEmptyDescendants(element);

        const style = `contain: size; contain-intrinsic-inline-size: 111px;`;
        element.setAttribute("style", style)

        if (tag === "mo") {
            element.setAttribute("lspace", "0");
            element.setAttribute("rspace", "0");
        }

        const elementContainerWidth = elementContainer.getBoundingClientRect().width;
        const elementBox = element.getBoundingClientRect();

        test(function() {
            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
            assert_equals(elementContainerWidth, 111);
        }, `intrinsic size of ${tag} with ${style}`);

        test(function() {
            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
            assert_equals(elementBox.width, 111);
        }, `inline-size of ${tag} with ${style}`);

        div.style = "display: none;"; // Hide the div after measurement.
    }

    done();
  }
</script>
</head>
<body>
  <div id="log"></div>
</body>
</html>
